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PPP, L2TP, check source ip address and port

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Improve L2TP defensiveness by checking source ip address and port
of input packets.
This commit is contained in:
Sylvain Rochet 2015-03-01 21:12:48 +01:00
parent 1bee131d52
commit 52f2221be9
1 changed files with 9 additions and 0 deletions
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9
src/netif/ppp/pppol2tp.c
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@ -349,6 +349,15 @@ static void pppol2tp_input(void *arg, struct udp_pcb *pcb, struct pbuf *p, const
goto free_and_return;
}
if (!ip_addr_cmp(&l2tp->remote_ip, addr)) {
goto free_and_return;
}
/* discard packet if port mismatch, but only if we received a SCCRP */
if (l2tp->phase > PPPOL2TP_STATE_SCCRQ_SENT && l2tp->tunnel_port != port) {
goto free_and_return;
}
/* printf("-----------\nL2TP INPUT, %d\n", p->len); */
p = ppp_singlebuf(p);